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+// Ex 28 Page 370
+
+clc;clear;close;
+// Given
+Rs=1000;//ohm
+Rc1=2*1000;//ohm
+Re2=2*1000;//ohm
+//CE configuration
+hie=1100;//ohm
+hre=2.5*10**-4;
+hfe=50;
+hoe=25*10**-6;//s
+//CC configuration
+hic=1.1;//kohm
+hrc=1;
+hfc=-51;
+hoc=25*10**-6;//s
+
+printf("for 2nd stage(CC stage)")
+AI2=-hfc/(1+hoe*Re2);//current gain
+Ri2=hic+hrc*AI2*Re2;//kohm
+Av2=AI2*Re2/Ri2;//Voltage Gain
+printf("\n current gain = %0.2f",AI2)
+printf("\n Input impedence = %0.2f kohm",Ri2/1000)
+printf("\n Voltage gain = %0.2f",Av2)
+
+printf("\n\n for 1st stage(CE stage)")
+RL1=Rc1*Ri2/(Rc1+Ri2);//kohm
+AI1=-hfe/(1+hoe*RL1);//current gain
+printf("\n current gain = %.2f",AI1)
+Ri1=hie+hre*AI1*RL1;//kohm
+printf("\n Input impedence = %0.2f kohm",Ri1/1000)
+Av1=AI1*RL1/Ri1;//Voltage gain
+printf("\n Voltage gain = %0.2f",Av1)
+Ro1=1/(hoe-hfe*hre/(hie+100));//ohm
+printf("\n Output impedence = %.2f kohm",Ro1/1000)
+Ro1dash=Ro1*Rc1/(Ro1+Rc1);///ohm
+printf("\n Output impedence taking Rc1 into account = %.2f kohm",Ro1dash/1000)
+
+printf("\n\n for overall amplifier")
+Ro=1/(hoc*100-hfc*hrc/(hic+Ro1dash));//ohm
+printf("\n Output impedence = %.2f ohm",Ro)
+Rodash=Ro*Re2*1000/(Ro1+Re2*1000);///ohm
+printf("\n Output impedence taking Re2 into account = %.2f ohm",Rodash)
+AI=AI1*AI2*Rc1/(Ri2+Rc1);// current gain
+printf("\n current gain = %.2f",AI)
+Av=Av1*Av2;//voltage gain
+printf("\n Voltage gain = %.2f",Av)
+//answer is wrong for overall amplifier in the book.